"I'm confident we'll make the signings we need because of the desire of the players to join us," said the manager.
"While we maybe don't have as much money as everybody writes, we have some funds available to do transfers.
"We've worked on it very hard but it hasn't come off as quickly and as well as we wanted.
"You'd be surprised how early we acted. You can spend a lot of time - not going on holiday - and work on things without it coming off.
"In football you have to deal with any situation and be patient. As long as the window is open, anything can happen until the last minute."
As well as Benzema and Di Maria, Arsenal are understood to be interested in bringing in a keeper and a defender.